Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof, the left side being the same in appearance as the right side; and,

FIG. 6 is right side elevational view thereof showing the clock body in an inclined state. 

The ornamental design for a clock, as shown and described. 